Rotary kiln and cooler



July4 7, 1931. T. LINDHARD .1,813,061

RoTARY KILN AND COOLER Filed Dec. 18. 1928 .1 v Mm "w: u

NI/ENTOR Patented July 7, 1931 UNITED srnrlzsv PATENT OFFICE POV'L T. LINDHARD, OF BROOKLYN, NEW YORK, ASSIGNOR TO F. L. SMIDTH & CO., OF

` NEW YORK, N. Y., A CORPORATION OF NEW JERSEY ROTARY K ILN AND COOLER Application filed December 18, 1928. Serial No. 326,749.

In the practical operation of rotary kilns and coolers of the type of that illustrated in Letters Patent of theY United States No.

1,675,416ldated July 3, 1928, in which the hot clinker is discharged through peripheral openings'fin the kiln into cooling dru'ms of a circumferential series which are supported by the kiln and revolve with it, `it has been found that the capacity of the combined structure is somewhat reduced by the fact that some part of the clinker, which is discharged from the kiln 'into each of the cooling drums, as the cooling drum passes through the lowest point of its travel, falls back into the kiln as the cooling drum approaches and passes through the highest point of its travel. This defect in the operation of the kiln was overcome, at least in part, by the device shown in said Letters Patent, in which an obliquely disposed guide is placed within the cooling drum, at one side thereof, to direct the clinker onward into the drum and to prevent it from falling back into v the kiln in the continued revolution of the drum. The object of the present invention is to provide for the samegeneral purpose a device which shall be more eEective in operation, shall be more readily installed and less liable to derangement-by the hot clinker, and shall aid .materially in the cooling of the clinker. To attain these objects there is provided in each drum, at t-he place where the clinker is discharged from the kiln into the drum, a spiral Hight which immediately, in the continued revolution of the drum, conveys the clinker onward into the drum, where it can be taken up by the conveyor Hight, the spiral Hight which receives the clinker ,from the kiln being formed as a spiral enlargement of the drum, armed with radiating tins,

partly inlongitudinal section of so much of4 a combined kiln and cooler as is necessary to enable the invention to be understood.

F1gure 2 is a view of the same partly in end elevation as seen from the left hand in Figure 1 and partly in transverse section.

The kiln may be formed substantially as usual, having a shell 1 with afire-brick lining 5, and to be supported by tires 2 and rollers 3 on foundations 4. About the drum, near its lower or discharge end, are supported cooling drumsl, in a circumferential serles. The clinker is discharged from the, kiln through openings 16 into each drum 6 as 1t passes through the lowest point of its revolution with the kiln, being discharged therefrom into the corresponding drum of a similar series 7, if desired, or otherwise as may be most convenient. Each drum 6 is connected with the kiln through a tubular neck 14 and in the end portion of the drum, into which the clinker falls from the kiln, there is arranged a spiral enlargement of the drum itself, of greater diameter than -the body of the drum, this spiral Hight or enlargement having its end so placed with respect to the openings 16 that all ofthe clinker is received by the spiral Hight, the clinker being guided thereinto by a guide plate 9. The spiral Hight or enlargement extends for about two-thirds of the circumference of the kiln, as clearly shown in Figure 2, so that in the continued revolution of the drum with the kiln, in a counterclockwise direction, the clinker which falls into the receiving space of the drum is immediately removed from proximity to the openings 16 and passes onward into the drum so far that when the drum approaches the highest point of its revolution no part of the clinker will fall back into the kiln. The greater diameter of the spiral enlargement not only affords ample space for the reception of the clinker which is discharged from the kiln and prevents its return to the kiln in its continued rotation, but it aH'ords greater radiating surface, which is still furthernincreased by the provision of radiating ribs 10, so that the cooling of the clinker is considerably promoted.

I claim as my invention:

l. The' combination of a rotary kiln for use in the manufacture of cement, having in its end portion a circumferential series of openings through which the clinker is discharged, and a circumferential series of cooling drums supported by the kiln about itself and communicating respectively with the kiln about said openings, each of said drums being provided at its end portion with a spiral enlargement of greater diameter than the body of the drum to receive the @linker yas it is discharged from the kiln and urged onward into the drum.

2.' The combination of aA rotary kiln for use in the manufacture of cement, having in its end portion a circumferential series of openings through which the clinker is discharged, and a circumferential series of cooling drums supported by the kiln about itself and communicating respectively with the kiln about said openings, each of said drums being provided at its en d portion with a spiral enlargement of greater diameter than the body of the drum to receive the clinker as it is discharged from the kiln and urged onward into the drum, such enlargement being provided with radiating fins to promote the cooling of the clinker.

This specification signed this 17th day of December, A. D. 1928.

POVL T. LINDHARD. 

